|
|
jsspace 发表于 2014-7-2 10:56  + @2 |' V5 G+ F' a0 R: v# c2 `
次级不能接地，这个在61347-2-13上已经明确说明了
依据IEC61347-2-13 Clause 8.2, 满足条件的SELV都可以被人接触到，为什么不可以接地？
& [$ f! O2 M3 F4 I( m
f1 {& @8 Q! T5 ]' ^% {* O8.2 Output circuits of SELV- or SELV equivalent control gear may have exposed terminals if1 ~, b( k# r2 h( [' C
– the rated output voltage for constant voltage control gear or maximum output voltage for
' x4 |' @8 \" M" n* U# R: J* k3 hconstant current control gear under load does not exceed 25 V r.m.s.;
& E: `* }1 t& H. I# n3 P: w2 t/ r– the no-load output voltage does not exceed 33 V r.m.s. and the peak does not exceed
% Z' g: y1 _8 p2 b/ ?33 2 V.1 E3 M# J2 X& `; [5 a, [8 L& f
Compliance is checked by measuring the output voltage when steady conditions are
- }# h/ X7 H& O, K+ M. xestablished, the controlgear being connected to rated supply voltage and rated frequency. For
6 r3 ]" X% L0 p; C, J8 Cthe test under load, the controlgear is loaded with a resistance which would give rated output4 x8 P/ C: l* a4 j) _! K$ Y
at rated output voltage.2 x- _! |# ]7 t& ]; \
For controlgear with more than one rated supply voltage, the requirement is applicable for3 o* J! B$ w+ D$ K- P
each of the rated supply voltages./ H& s2 n+ l5 u, H/ _; s7 x: Y
Controlgear with a rated output voltage above 25 V shall have insulated terminals. |
|
|关于安规|小黑屋|安规QQ群|Archiver|手机版|安规网
( 粤ICP13023453-10 ) 
窥视卡
雷达卡
发表于 2014-7-2 10:56
显身卡
